﻿IS 
  

  

  H. 
  S. 
  Pratt, 
  

  

  among 
  the 
  viscera 
  throughout 
  tlie 
  abdonien. 
  All 
  of 
  these 
  organs 
  

   will 
  be 
  described 
  in 
  detail 
  further 
  cm. 
  

  

  The 
  relative 
  size 
  of 
  the 
  genital 
  tract 
  is 
  large, 
  even 
  in 
  the 
  virg- 
  

   inal 
  fernale, 
  where 
  its 
  length 
  is 
  two-thirds 
  that 
  of 
  the 
  abdomen 
  

   (PI. 
  II, 
  Fig. 
  3), 
  while 
  in 
  the 
  old 
  female 
  its 
  size 
  depends 
  entirely 
  on 
  

   the 
  age 
  of 
  the 
  growing 
  larva, 
  when 
  one 
  is 
  present, 
  in 
  the 
  uterus. 
  

   The 
  sheep-tick 
  is, 
  in 
  common 
  with 
  the 
  rest 
  of 
  the 
  Pupipara, 
  an 
  ovo- 
  

   viviparous 
  animal. 
  The 
  young 
  animals 
  are 
  born 
  one 
  at 
  a 
  time 
  and 
  

   at 
  intervals, 
  in 
  the 
  Summer-time, 
  of 
  several 
  weeks. 
  The 
  entire 
  

   embryonic 
  stage 
  and 
  the 
  greater 
  portion 
  of 
  the 
  larval 
  stage 
  are 
  

   passed 
  in 
  the 
  mother's 
  uterus, 
  the 
  young 
  animal 
  being 
  born 
  as 
  an 
  

   old 
  larva. 
  About 
  twelve 
  hours 
  after 
  the 
  larva 
  is 
  born 
  the 
  puparium 
  

   is 
  completed 
  and 
  the 
  »Tonnenpuppe« 
  begins 
  its 
  metamorphosis 
  1 
  . 
  

   The 
  name 
  »Pupipara« 
  is 
  thus 
  a 
  misnomer 
  as 
  Blanchaed 
  and 
  

   Leuckaet 
  have 
  shown, 
  as 
  the 
  sheep-tick 
  is 
  not 
  a 
  pupa-bearing 
  in- 
  

   sect, 
  and 
  rests 
  on 
  a 
  misconception 
  of 
  Latreille, 
  who 
  named 
  the 
  

   group. 
  In 
  an 
  insect, 
  whose 
  uterus 
  is 
  either 
  empty 
  or 
  contains 
  an 
  

   egg 
  or 
  a 
  very 
  young 
  larva, 
  the 
  genital 
  tract 
  is, 
  as 
  in 
  the 
  virginal 
  

   animal, 
  about 
  two-thirds 
  the 
  length 
  of 
  the 
  abdomen 
  (PI. 
  II, 
  Fig. 
  1), 
  

   but 
  the 
  presence 
  of 
  an 
  old 
  larva 
  in 
  the 
  uterus 
  distends 
  the 
  repro- 
  

   ductive 
  tract 
  in 
  all 
  directions, 
  so 
  that 
  it 
  may 
  become 
  quite 
  as 
  long* 
  

   as 
  the 
  abdomen 
  and 
  half 
  as 
  wide 
  and 
  half 
  as 
  thick 
  (PI. 
  II, 
  Fig. 
  4). 
  

  

  The 
  vulva. 
  

  

  The 
  vulva 
  is 
  a 
  half-moon-shaped 
  slit, 
  0,40 
  mm 
  long, 
  transverse 
  

   to 
  the 
  longitudinal 
  axis 
  of 
  the 
  body 
  and 
  situated 
  at 
  the 
  posterior 
  

   end 
  of 
  the 
  body 
  near 
  the 
  ventral 
  surface 
  (PI. 
  II, 
  Fig. 
  1 
  vul). 
  It 
  is 
  

   0,27 
  mm 
  anteriad 
  and 
  ventrad 
  of 
  the 
  anus 
  (PL 
  II, 
  Fig. 
  1 
  and 
  3 
  A) 
  from 
  

   which 
  it 
  is 
  separated 
  by 
  a 
  thick 
  chitinous 
  plate 
  (ch.pl) 
  well 
  studded 
  

   with 
  small 
  chitinous 
  bristles. 
  Each 
  lip 
  of 
  the 
  vulva 
  is 
  bounded 
  by 
  

   a 
  projecting 
  chitinous 
  ridge 
  which, 
  Coming 
  from 
  above 
  and 
  below, 
  

   almost 
  close 
  the 
  opening. 
  The 
  anterior 
  and 
  most 
  ventrally 
  situated 
  

   lip 
  represents 
  the 
  concave 
  side 
  of 
  the 
  half-moon 
  (PI. 
  II, 
  Fig. 
  ) 
  ). 
  It 
  

   is 
  composed 
  of 
  a 
  pair 
  of 
  chitinous 
  plates, 
  one 
  to 
  the 
  right 
  and 
  the 
  

   other 
  to 
  the 
  left 
  of 
  the 
  median 
  line. 
  These 
  plates 
  do 
  not, 
  however, 
  

   meet 
  in 
  the 
  median 
  line 
  except 
  at 
  their 
  posterior, 
  median 
  margins 
  

   where 
  they 
  are 
  connected 
  by 
  a 
  median, 
  rectangular 
  thickening 
  (spur). 
  

  

  1 
  A 
  description 
  of 
  the 
  larva 
  of 
  Melophagus 
  will 
  be 
  found 
  in 
  »Beiträge 
  zur 
  

   Kenntnis 
  der 
  Pupiparen: 
  die 
  Larve 
  von 
  Melophagus 
  ovinus« 
  von 
  H. 
  S. 
  Phatt, 
  

   in 
  Archiv 
  für 
  Naturgeschichte, 
  53. 
  Jahrg., 
  1893. 
  

  

  